linux-firmware: update to 20170622

Add checksum, remove git dependency.

Closes: #7093 [via git-merge-pr]

srcpkgs/linux-firmware/template

@@ -1,22 +1,17 @@
 # Template file for 'linux-firmware'
 pkgname=linux-firmware
-version=20170615
+version=20170622
 revision=1
+_githash=7d2c913dcd1be083350d97a8cb1eba24cfacbc8a
 noarch=yes
 short_desc="Binary firmware blobs for the Linux kernel"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"
-homepage="http://www.kernel.org/"
+homepage="https://www.kernel.org/"
 license="See /usr/share/licenses/${pkgname}"
-hostmakedepends="git"
 depends="${pkgname}-amd-${version}_${revision} ${pkgname}-network-${version}_${revision}"
-
-do_fetch() {
-	local _githash=a3a26af24e29c818ef9b5661856018e21a5c49fb
-	local _url="git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git"
-	git clone ${_url} ${wrksrc}
-	cd ${wrksrc}
-	git checkout ${_githash}
-}
+distfiles="https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/snapshot/${pkgname}-${_githash}.tar.gz"
+checksum=03d220c1747ed71b54b53ce04bfb178fe937ba585309b4a0b32eb351d709fcb0
+wrksrc="${pkgname}-${_githash}"
 
 do_install() {
 	vmkdir usr/lib/firmware